EFFECTS OF REPRODUCTIVE STAGE AND TEMPERATURE ON RATES OF OXYGEN CONSUMPTION IN PARALITHODES PLATYPUS (DECAPODA: ANOMURA)

ROMERO M.C.,; TAPELLA, F.; STEVENS, B.G.; BUCK, C.L.

JOURNAL OF CRUSTACEAN BIOLOGY

CRUSTACEAN SOC

Año: 2010 vol. 30 p. 393 - 400

0278-0372

Paralithodes platypus is a large decapod that inhabits Alaskan and North Pacific waters. Females exhibit a biennial spawning cycle, requiring two years for production of fully mature oocytes. We used respirometry and video recording to determine (1) metabolic rates of brooding and post-brooding females, embryos, and larvae at different temperatures, (2) if females exhibit active brood care, (3) oxygen availability within the clutch and (4) the timing of larval hatching. Rates of oxygen consumption (MO2) of brooding females was significantly higher than that of post-brooding females at night, but was similar during the day and increased significantly with temperature. MO2 of crab embryos did not differ with position in the clutch, whereas MO2 of zoeae averaged 4-fold higher than that of embryos. Larvae from the periphery of the embryo mass, either top or bottom, hatched prior to larvae from the middle. Oxygen availability in the embryo mass varied significantly with position in the clutch; saturation was highest at the top (~ 91 %), and lowest at the middle (~ 66 %). Abdominal flapping in brooding females was coincident with sudden increases in oxygen availability at the bottom of the embryo mass. The percentage of time that brooding females were engaged in abdominal flapping was 30 % higher at night than during the day. Our results address the cost of brooding in a Lithodid crab and the effects of temperature on this behavior. The importance of abdominal flapping to ventilation of the embryo mass and alternative hatching mechanisms is discussed.